/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with the License.  You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package org.apache.zookeeper.server;

import java.util.Date;

/**
 * Statistics on the ServerCnxn
 */
interface Stats {
    /** Date/time the connection was established
     * @since 3.3.0 */
    Date getEstablished();

    /**
     * The number of requests that have been submitted but not yet
     * responded to.
     */
    long getOutstandingRequests();

    /** Number of packets received */
    long getPacketsReceived();

    /** Number of packets sent (incl notifications) */
    long getPacketsSent();

    /** Min latency in ms
     * @since 3.3.0 */
    long getMinLatency();

    /** Average latency in ms
     * @since 3.3.0 */
    long getAvgLatency();

    /** Max latency in ms
     * @since 3.3.0 */
    long getMaxLatency();

    /** Last operation performed by this connection
     * @since 3.3.0 */
    String getLastOperation();

    /** Last cxid of this connection
     * @since 3.3.0 */
    long getLastCxid();

    /** Last zxid of this connection
     * @since 3.3.0 */
    long getLastZxid();

    /** Last time server sent a response to client on this connection
     * @since 3.3.0 */
    long getLastResponseTime();

    /** Latency of last response to client on this connection in ms
     * @since 3.3.0 */
    long getLastLatency();

    /** Reset counters
     * @since 3.3.0 */
    void resetStats();
}
